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Vibration guide Vibration Severity Chart How To Use This Severity Chart -in- chart plots vibration measure and levels for Acceleration vs CPM Velocity vs CPM and Displacement vs CPM Knowing a machine ? s RPM i e CPM and the vibration sensing technique see

Vibration Severity Chart How To Use This Severity Chart -in- chart plots vibration measure and levels for Acceleration vs CPM Velocity vs CPM and Displacement vs CPM Knowing a machine ? s RPM i e CPM and the vibration sensing technique see table below determine how the machine should perform when new or rebuilt and what level might warrant an ALERT or DANGER condition Simpli ?ed table below graph is o ?ered for typical acceptance criteria for seismic casing and shaft proximity vibration VELOCITY mm s IPS EXAMPLE FAN mm s ips pk EXAMPLE FAN um mils DISPL MACILESM EPNKT-PuKm G ACCGE LPEKRATION G BAD ROUGH FAIR REFERENCE MATERIAL EXAMPLE FAN cpm G ACCEPTABLE DESIRABLE G G G EXAMPLE FAN g K MIL INCH UM UM - M MIL IPS IN SEC MM S MM S MILLIMETER SEC IPS G ACCEL DUE TO GRAVITY IN SEC M S CPM CYCLE PER MINUTE CYCLES SEC HZ X RMS PK X FOR SINE WAVE VIBRATION FREQUENCY IN CPM e g MACHINE RPM NOTES for determining a setpoint e g alarm and or danger limit for machine protection monitoring Metrix Instrument Co will not be held liable for setpoint determination Consult machinery manufacturer OEM for recommendations They know their machinery best As a starting point only the following is from over years of company ?eld experience and is o ?ered free from charge Operating Speed All RPM Application Sensing Technique Common Measurand NEW Typical Vibration Reading Setpoints ALERT DANGER Rolling element brgs Seismic - on bearing case Velocity - ips pk - mm s RMS - ips pk - mm s RMS - ips pk - mm s RMS - ips pk - mm s RMS - ips pk - mm s RMS - ips pk - mm s RMS Hydrodynamic K RPM K Journal Bearings CPM Gearmesh Non-contact Proximity thru case Displacement Acoustic atop gears Acceleration - mil pk-pk - mil pk-pk - g pk - um pk-pk - um pk-pk - g RMS - mil pk-pk - mil pk-pk - g pk - um - mil - um pk-pk pk-pk pk-pk - um - mil - um pk-pk pk-pk pk-pk - g RMS - g pk - g RMS Refers to constant speed machines For variable speed machines velocity severity is constant Note from the chart that the displacement and acceleration measureands vary with speed and are not normally used due to complex severity determination Vibration - Condition Monitoring and Protection www metrix com ? info metrix com Sales Service Tel - - ? Fax - - ? CREFERENCE MATERIAL Charts Guides Conversion Between F and C C F C C F F C - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - F Relationships of Sinusoidal Velocity Acceleration Displacement ENGLISH V ?fD V g f g